1. In a typical toilet a floating ball is used to close off the water filling the cistern when it reaches a certain level - see schematic below. If 10 lbs of force are required to shut the valve what size does the pall have to be in inches? (ans = 9")

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Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.